package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.constant.UserConstant;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import com.yupi.yupicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
* @author ASUS
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-09-11 19:54:32
*/
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService{

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        //1.校验参数
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if (userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短");
        }
        if (!userPassword.equals(checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"两次输入的密码不一致");
        }
        //2.检查用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount",userAccount);
        long count = this.count(queryWrapper);
        if (count > 0){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户已存在");
        }
        //3.密码加密
        String encryptPassword = getEncrypyPassword(userPassword);
        //4.插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("无名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if (!saveResult){
            throw new BusinessException(ErrorCode.SYSTEM_ERROR,"注册失败");
        }
        return user.getId();
    }



    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.校验参数
        if (StrUtil.hasBlank(userAccount, userPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if (userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号不存在");
        }
        //2.加密密码
        String encryptPassword = getEncrypyPassword(userPassword);
        //3.查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount",userAccount);
        queryWrapper.eq("userPassword",encryptPassword);
        User user = this.getOne(queryWrapper);
        //用户不存在，异常
        if (user == null){
            log.info("用户不存在");
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户不存在或密码错误");
        }
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE,user);

        return this.getLoginUserVO(user);
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        Object userobj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userobj;
        if (currentUser == null|| currentUser.getId() == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        //最好再查一次数据库
        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    /**
     *
     * @param user
     * @return
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null){
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtil.copyProperties(user,loginUserVO);
        return loginUserVO;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null){
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user,userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)){
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }



    @Override
    public boolean UserLogout(HttpServletRequest request) {
        Object userobj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        if (userobj == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }

    @Override
    public String getEncrypyPassword(String userPassword) {
        final  String SALT = "batian";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    /**
     * 查询用户
     * @param userQueryRequest
     * @return
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null){
            throw new  BusinessException(ErrorCode.PARAMS_ERROR,"请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userName = userQueryRequest.getUserName();
        String userAccount = userQueryRequest.getUserAccount();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();

        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id),"id",id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userName", userProfile);
        queryWrapper.orderBy(StrUtil.isNotBlank(sortField),
                sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }
}




